Undrained Response of Clean and Silty Sands (original) (raw)
An experimental investigation was undertaken to study the effect of small amounts nonplastic fines on the undrained shear response of sands. Mixtures of Ottawa sand containing 0, 5, 10 and 15% nonplastic silts were studied in a triaxial set up under undrained conditions. The response of the mixtures was summarized based on four characteristic states observed during undrained shearing. These states are the flow liquefaction state, the phase transformation state, the quasi steady state and the critical state. The effects of silt content and initial fabric on relationships describing these characteristic states are highlighted in this paper.
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Japanese Geotechnical Journal, 2014
Drained cyclic pre-shearing and high temperature consolidation were discussed and evaluated as acceleration of the aging effect that rise liquefaction resistance of sandy soils. The raised liquefaction resistance characteristics, i.e. repeatability, anisotropy and degree of the liquefaction resistance raising were clarified. The acceleration of aging effect of drained pre-shearing was evaluated to several thousand years of consolidation. The high temperature consolidation was evaluated to thousand times of real consolidation period.
A Study of Sandbar Formation on Bedrock and Bedrock Erosional Morphology
Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
2 正会員 工博 寒地土木研究所 寒地河川チーム(〒062-8602 札幌市豊平区平岸1条3丁目1-34) 3 正会員 工博 北海道大学工学研究院教授(〒060-0813 札幌市北区北13条西8丁目) Several rivers in Hokkaido are facing riverbed degradation by countermeasures such as Sabo dams. The riverbed widely exposed can be eroded by collision of gravel particles. Previous studies have discussed sandbar formation on the fixed-bed and mechanisms of bedrock erosion. However, bedrock erosional morphology by sandbar formation had not been carried out. The experiments are conducted in the flume into which mortar is placed to imitate bedrock. Alternate sandbars are observed during the experiments. The results suggest that both sides of the channel are eroded with sediment transportation by sandbar formation. Moreover, it is confirmed that sediment supply rate and initial alluvial thickness have a large impact on bedrock erosional morphology.
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